The night before Micah X. Johnson ambushed police in Dallas, his younger sister posted a Facebook message deriding white cops as murderers and declaring that, “I for one think these cops need to get a taste of the life we now fear.”

As seen above, Nicole Johnson’s post noted that, “White ppl have and will continue to kill us off.”

Shortly before Johnson posted her message Wednesday evening, she uploaded a New York Times video that included footage of the struggle that ended Tuesday night with the death of Alton Sterling, who was shot to death by Baton Rouge cops.

Earlier this afternoon, Johnson wrote that she was “shutting down my Facebook as the news is stealing my private words, photos and harassing my friends. When its safe i will hop back on here.” Her page, however, remains online. [Update: Johnson’s Facebook page was deleted around 5 PM EST.]